1/*
2 * max8907.c - mfd driver for MAX8907
3 *
4 * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
5 * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/err.h>
13#include <linux/i2c.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/irq.h>
17#include <linux/mfd/core.h>
18#include <linux/mfd/max8907.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/of_device.h>
22#include <linux/regmap.h>
23#include <linux/slab.h>
24
25static const struct mfd_cell max8907_cells[] = {
26 { .name = "max8907-regulator", },
27 { .name = "max8907-rtc", },
28};
29
30static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg)
31{
32 switch (reg) {
33 case MAX8907_REG_ON_OFF_IRQ1:
34 case MAX8907_REG_ON_OFF_STAT:
35 case MAX8907_REG_ON_OFF_IRQ2:
36 case MAX8907_REG_CHG_IRQ1:
37 case MAX8907_REG_CHG_IRQ2:
38 case MAX8907_REG_CHG_STAT:
39 return true;
40 default:
41 return false;
42 }
43}
44
45static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg)
46{
47 switch (reg) {
48 case MAX8907_REG_ON_OFF_IRQ1:
49 case MAX8907_REG_ON_OFF_IRQ2:
50 case MAX8907_REG_CHG_IRQ1:
51 case MAX8907_REG_CHG_IRQ2:
52 return true;
53 default:
54 return false;
55 }
56}
57
58static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
59{
60 return !max8907_gen_is_volatile_reg(dev, reg);
61}
62
63static const struct regmap_config max8907_regmap_gen_config = {
64 .reg_bits = 8,
65 .val_bits = 8,
66 .volatile_reg = max8907_gen_is_volatile_reg,
67 .precious_reg = max8907_gen_is_precious_reg,
68 .writeable_reg = max8907_gen_is_writeable_reg,
69 .max_register = MAX8907_REG_LDO20VOUT,
70 .cache_type = REGCACHE_RBTREE,
71};
72
73static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
74{
75 if (reg <= MAX8907_REG_RTC_YEAR2)
76 return true;
77
78 switch (reg) {
79 case MAX8907_REG_RTC_STATUS:
80 case MAX8907_REG_RTC_IRQ:
81 return true;
82 default:
83 return false;
84 }
85}
86
87static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)
88{
89 switch (reg) {
90 case MAX8907_REG_RTC_IRQ:
91 return true;
92 default:
93 return false;
94 }
95}
96
97static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)
98{
99 switch (reg) {
100 case MAX8907_REG_RTC_STATUS:
101 case MAX8907_REG_RTC_IRQ:
102 return false;
103 default:
104 return true;
105 }
106}
107
108static const struct regmap_config max8907_regmap_rtc_config = {
109 .reg_bits = 8,
110 .val_bits = 8,
111 .volatile_reg = max8907_rtc_is_volatile_reg,
112 .precious_reg = max8907_rtc_is_precious_reg,
113 .writeable_reg = max8907_rtc_is_writeable_reg,
114 .max_register = MAX8907_REG_MPL_CNTL,
115 .cache_type = REGCACHE_RBTREE,
116};
117
118static const struct regmap_irq max8907_chg_irqs[] = {
119 { .reg_offset = 0, .mask = 1 << 0, },
120 { .reg_offset = 0, .mask = 1 << 1, },
121 { .reg_offset = 0, .mask = 1 << 2, },
122 { .reg_offset = 1, .mask = 1 << 0, },
123 { .reg_offset = 1, .mask = 1 << 1, },
124 { .reg_offset = 1, .mask = 1 << 2, },
125 { .reg_offset = 1, .mask = 1 << 3, },
126 { .reg_offset = 1, .mask = 1 << 4, },
127 { .reg_offset = 1, .mask = 1 << 5, },
128 { .reg_offset = 1, .mask = 1 << 6, },
129 { .reg_offset = 1, .mask = 1 << 7, },
130};
131
132static const struct regmap_irq_chip max8907_chg_irq_chip = {
133 .name = "max8907 chg",
134 .status_base = MAX8907_REG_CHG_IRQ1,
135 .mask_base = MAX8907_REG_CHG_IRQ1_MASK,
136 .wake_base = MAX8907_REG_CHG_IRQ1_MASK,
137 .irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1,
138 .num_regs = 2,
139 .irqs = max8907_chg_irqs,
140 .num_irqs = ARRAY_SIZE(max8907_chg_irqs),
141};
142
143static const struct regmap_irq max8907_on_off_irqs[] = {
144 { .reg_offset = 0, .mask = 1 << 0, },
145 { .reg_offset = 0, .mask = 1 << 1, },
146 { .reg_offset = 0, .mask = 1 << 2, },
147 { .reg_offset = 0, .mask = 1 << 3, },
148 { .reg_offset = 0, .mask = 1 << 4, },
149 { .reg_offset = 0, .mask = 1 << 5, },
150 { .reg_offset = 0, .mask = 1 << 6, },
151 { .reg_offset = 0, .mask = 1 << 7, },
152 { .reg_offset = 1, .mask = 1 << 0, },
153 { .reg_offset = 1, .mask = 1 << 1, },
154};
155
156static const struct regmap_irq_chip max8907_on_off_irq_chip = {
157 .name = "max8907 on_off",
158 .status_base = MAX8907_REG_ON_OFF_IRQ1,
159 .mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK,
160 .irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1,
161 .num_regs = 2,
162 .irqs = max8907_on_off_irqs,
163 .num_irqs = ARRAY_SIZE(max8907_on_off_irqs),
164};
165
166static const struct regmap_irq max8907_rtc_irqs[] = {
167 { .reg_offset = 0, .mask = 1 << 2, },
168 { .reg_offset = 0, .mask = 1 << 3, },
169};
170
171static const struct regmap_irq_chip max8907_rtc_irq_chip = {
172 .name = "max8907 rtc",
173 .status_base = MAX8907_REG_RTC_IRQ,
174 .mask_base = MAX8907_REG_RTC_IRQ_MASK,
175 .num_regs = 1,
176 .irqs = max8907_rtc_irqs,
177 .num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
178};
179
180static struct max8907 *max8907_pm_off;
181static void max8907_power_off(void)
182{
183 regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,
184 MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);
185}
186
187static int max8907_i2c_probe(struct i2c_client *i2c,
188 const struct i2c_device_id *id)
189{
190 struct max8907 *max8907;
191 int ret;
192 struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);
193 bool pm_off = false;
194
195 if (pdata)
196 pm_off = pdata->pm_off;
197 else if (i2c->dev.of_node)
198 pm_off = of_property_read_bool(i2c->dev.of_node,
199 "maxim,system-power-controller");
200
201 max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
202 if (!max8907) {
203 ret = -ENOMEM;
204 goto err_alloc_drvdata;
205 }
206
207 max8907->dev = &i2c->dev;
208 dev_set_drvdata(max8907->dev, max8907);
209
210 max8907->i2c_gen = i2c;
211 i2c_set_clientdata(i2c, max8907);
212 max8907->regmap_gen = devm_regmap_init_i2c(i2c,
213 &max8907_regmap_gen_config);
214 if (IS_ERR(max8907->regmap_gen)) {
215 ret = PTR_ERR(max8907->regmap_gen);
216 dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret);
217 goto err_regmap_gen;
218 }
219
220 max8907->i2c_rtc = i2c_new_dummy(i2c->adapter, MAX8907_RTC_I2C_ADDR);
221 if (!max8907->i2c_rtc) {
222 ret = -ENOMEM;
223 goto err_dummy_rtc;
224 }
225 i2c_set_clientdata(max8907->i2c_rtc, max8907);
226 max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc,
227 &max8907_regmap_rtc_config);
228 if (IS_ERR(max8907->regmap_rtc)) {
229 ret = PTR_ERR(max8907->regmap_rtc);
230 dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret);
231 goto err_regmap_rtc;
232 }
233
234 irq_set_status_flags(max8907->i2c_gen->irq, IRQ_NOAUTOEN);
235
236 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
237 IRQF_ONESHOT | IRQF_SHARED, -1,
238 &max8907_chg_irq_chip,
239 &max8907->irqc_chg);
240 if (ret != 0) {
241 dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
242 goto err_irqc_chg;
243 }
244 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
245 IRQF_ONESHOT | IRQF_SHARED, -1,
246 &max8907_on_off_irq_chip,
247 &max8907->irqc_on_off);
248 if (ret != 0) {
249 dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
250 goto err_irqc_on_off;
251 }
252 ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
253 IRQF_ONESHOT | IRQF_SHARED, -1,
254 &max8907_rtc_irq_chip,
255 &max8907->irqc_rtc);
256 if (ret != 0) {
257 dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
258 goto err_irqc_rtc;
259 }
260
261 enable_irq(max8907->i2c_gen->irq);
262
263 ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
264 ARRAY_SIZE(max8907_cells), NULL, 0, NULL);
265 if (ret != 0) {
266 dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);
267 goto err_add_devices;
268 }
269
270 if (pm_off && !pm_power_off) {
271 max8907_pm_off = max8907;
272 pm_power_off = max8907_power_off;
273 }
274
275 return 0;
276
277err_add_devices:
278 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
279err_irqc_rtc:
280 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
281err_irqc_on_off:
282 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
283err_irqc_chg:
284err_regmap_rtc:
285 i2c_unregister_device(max8907->i2c_rtc);
286err_dummy_rtc:
287err_regmap_gen:
288err_alloc_drvdata:
289 return ret;
290}
291
292static int max8907_i2c_remove(struct i2c_client *i2c)
293{
294 struct max8907 *max8907 = i2c_get_clientdata(i2c);
295
296 mfd_remove_devices(max8907->dev);
297
298 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
299 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
300 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
301
302 i2c_unregister_device(max8907->i2c_rtc);
303
304 return 0;
305}
306
307#ifdef CONFIG_OF
308static const struct of_device_id max8907_of_match[] = {
309 { .compatible = "maxim,max8907" },
310 { },
311};
312MODULE_DEVICE_TABLE(of, max8907_of_match);
313#endif
314
315static const struct i2c_device_id max8907_i2c_id[] = {
316 {"max8907", 0},
317 {}
318};
319MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
320
321static struct i2c_driver max8907_i2c_driver = {
322 .driver = {
323 .name = "max8907",
324 .of_match_table = of_match_ptr(max8907_of_match),
325 },
326 .probe = max8907_i2c_probe,
327 .remove = max8907_i2c_remove,
328 .id_table = max8907_i2c_id,
329};
330
331static int __init max8907_i2c_init(void)
332{
333 int ret = -ENODEV;
334
335 ret = i2c_add_driver(&max8907_i2c_driver);
336 if (ret != 0)
337 pr_err("Failed to register I2C driver: %d\n", ret);
338
339 return ret;
340}
341subsys_initcall(max8907_i2c_init);
342
343static void __exit max8907_i2c_exit(void)
344{
345 i2c_del_driver(&max8907_i2c_driver);
346}
347module_exit(max8907_i2c_exit);
348
349MODULE_DESCRIPTION("MAX8907 multi-function core driver");
350MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
351MODULE_LICENSE("GPL v2");
352